Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Osmotic pressure of a solution containing 2 g dissolved protain per 300cm^(3)id solution is 20 mm of Hg at 27^(@)C. Calculate the molecular mass of protein. (R=0.082 L atm K^(-1)mol^(-1))

Answer»


Solution :`W_(B)=2.0g, V=300 cm^(3)=300 mL=0.3 L`
`pi=20" mm of HG"=20/760=0.02632" atm, "R=0.0821" L atm K"^(-1)mol^(-1)`
`T=27^(@)C=27+273=300K, M_(B)=?`
`M_(B)=(W_(B)xxRxxT)/(pixxV)=((2.0g)xx(0.0821"L atm K"^(-1)mol^(-1))xx(300K))/((0.02632 atm)xx(0.3 L))=6238.6"g mol"^(-1)`.
2.

Osmotic pressure of a 0.0103 molar solution of an electrolyte was found to be 0.70 atm at 27^(@)C. Calculate Van't Hoff factor.

Answer»


SOLUTION :`"Osmotic PRESSURE"(pi)= I R C T`
`pi=0.70" atm",C=0.0103" mol L"^(-1), R=0.0821" L atm K"^(-1)mol^(-1)`
`T=27+273=300 K`
`i=pi/(CRT)=((0.70"atm"))/((0.0103" mol L"^(-1))XX(0.0821"L atm K"^(-1)mol^(-1))xx(300K))=2.76~~3`.
3.

Osmotic pressure of 4% (weight/vol) urea solution is 1.64 atm and that of 3.42% (weight/volume) cane sugar is 2.46 atm when equal volumes of the above two solutions are mixed, the osmotic pressure of the resulting solution is:

Answer»

1.64 ATM
2.46 atm
4.1 atm
2.05 atm

ANSWER :D
4.

Osmotic pressure of 0.1 M solution of NaCl and Na_(2)SO_(4) will be

Answer»

Same
Osmotic pressure of NACL solution will be more than `Na_(2)SO_(4)` solution
Osmotic pressure of `Na_(2)SO_(4)` solution will be more than NaCl
Osmotic pressure of `NaSO_(4)` will be less than that of NaCl solution

Solution :`Na_(2)SO_(4)` have more osmotic pressure than NaCl solution because `Na_(2)SO_(4)` GIVES 3 IONS.
5.

Osmotic pressure is the minimum pressure that has to be applied on the …………..to prevent that entry of………..from …………………….to……………… .

Answer»

SOLUTION :solution SOLVENT, solvent, solution
6.

Osmotic pressure observed when benzoic acid is dissolved in benbzene is less than that expected from throretical considerations. This is because

Answer»

BENZOIC acid is an ORGANIC solute
benzoic acid has higher molar mass than benzene
benzoic acid gets ASSOCIATED in benzene
benzoic acid gets dissociated in benzene

Solution :Benzoic acid associates in benzene as `2C_(6)H_(5)COOH hArr (C_(6)H_(5)COOH)_(2)`
The number of particles decreases and hence osmotic pressure decreases.
7.

Osmotic pressue of a solution is 0.0821 atm at a temperature of 400 K. Calculate concerntration of solution in moles /litre.

Answer»


SOLUTION :`"Osmotic PRESSURE of solutioin" (PI)=CRT`
`"Concentration of solution "( C)=pi/(RT)`
`=((0.0821" ATM"))/((0.0821"litre-atm K"^(-1)mol^(-1))xx400K)`
`=0.0025 mol^(-1) L^(-1)`.
8.

Osmotic pressure is measured by

Answer»

OSTWALD's method
Berkeley and HARTLEY method
Pfeffer's method
Beckmann's method.

Answer :B
9.

Osmotic pressure is a colligative property and it is proportional to the molarity of solution. What is osmotic pressure ?

Answer»

Solution :It is the MINIMUM excess pressure to be applied on the solution side to prevent osmosis, when the solution and the SOLVENT are SEPARATED by a SEMIPERMEABLE membrane.
10.

Osmostic pressure of a solution (density is 1 g/ml) containing 3 g of glucose (molecular weight =180) in 6o g of water at 15^@C is:

Answer»

0.34 atm
0.65 atm
6.25 atm
5.57 atm

Answer :C
11.

Osmium tetra oxide is a reagent used for

Answer»

hydroxylation of acetylenes
hydroxylation of olefins to give cis-diols
hydroxylation of olefins to form trans-diols
hydroxylation of CARBONYL compounds

ANSWER :B
12.

Osmosis is the spontaneous flow through a semipermeable membrane of :

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A LESS concentrated SOLUTION into more in to more concentrated solution
The Solvent from a solution of lower concentration to ONE of HIGHER concentration
Solute PARTICLES from a solution of higher concentration to one of lower concentration
None

Answer :B
13.

Osmotic pressure of 40% (wt./vol.) urea solution is 1.64 atm and that of 3.42% (wt./vol.) cane sugar is 2.46 atm. When equal volumes of the above two solutions are mixed, the osmotic pressure of the resultng solution is:

Answer»

1.64 atm
2.46 atm
4.10 atm
2.05 atm

Answer :D
14.

Osazone formation involves only 2-carbon atoms of glucose because of

Answer»

Oxidation
Reduction
Chelation
Hydrolysis

Answer :A
15.

Osazone formation involves only 2 carbon atoms of glucose because of

Answer»

chelation
oxidation
reduction
hydrolysis

Solution : OSAZONE formation involves only 2 CARBON ATOMS of GLUCOSE because of oxidation.
16.

Osazone formation involves only 2 carbon atoms of glucose because of :

Answer»

CHELATION
OXIDATION
Reduction
HYDROLYSIS

ANSWER :B
17.

Osazone fomation is sued to characterize

Answer»

polymers
sugars
carboxylic acid
alcohols

Answer :A::B
18.

Orthophosphoric acid on strong heating forms

Answer»

`P_(4)O_(10)`
`H_(4)P_(2)O_(7)`
`(HPO_(3))_(n)`
`P_(2)O_(5)`

ANSWER :D
19.

Orthophosphoric acid represents the molaysis condition due to

Answer»

HYDROGEN bonding
PHOSPHORUS GROUP
Maximum OXYGEN group
Tribasicity

Answer :B
20.

Orthophosphoric acid on heating gives

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phosphine
phosphorus PENTOXIDE
phosphorus ACID
 METAPHOSPHORIC acid

Answer :D
21.

Orthophosphoric acid on heating at 600^∘C gives:

Answer»

Phosphine
Phosphorus pentoxide
Phosphorus acid
Metaphosphoric acid

Answer :D
22.

Orthophosphoric acid is ionised in _______ steps:

Answer»

1
2
3
4

Answer :C
23.

Orthoboric acid when heated to red hot gives :

Answer»

METABORIC acid
Pyroboric acid
Boron and water
Boric anhydride

Answer :D
24.

Orthoboric acid (H_(3)BO_(3)) and metaboric acid (HBO_(2)) differ in respect off

Answer»

No. of `SIGMA`- bond
structure
melting point
oxidation

Answer :A::B::C
25.

Orthoboric acid in aqueous medium is

Answer»

MONOBASIC
Dibasic
TRIBASIC
All are correct

Solution :`H_(3)BO_(3) + H_(2)O hArr [B(OH)_(4)]^(-) + H^(+)`
`H_(3)BO_(3)` is a weak monobasic acid it does not act as a `H^(+)` donor but behaves as a LEWIS acid.
26.

Orthoboric acid is heated to red hot gives :

Answer»

METABORIC acid
tetraboric acid
boron trioxide
borax

Answer :C
27.

Orthoboric acid contains discrete units of :

Answer»

`BO_(2)^(-)`
`BO_(3)^(3-)`
`BO_(4)^(3-)`
`B(OH)_(3)`.

Solution :Orthoboric acid has discrete units of `BO_(3)^(-3)` bonded together through hydrogen bonds into two dimensional SHEET.
28.

Ortho silicates are also called as ………….

Answer»

Into silicates
Soro silicates
Neso silicates
Cyclic silicates

Answer :C
29.

Ortho-nitrophenol is less soluble in water than p- and m-nitrophenols because

Answer»

o-nitrophenol SHOWS INTRAMOLECULAR H-bonding
o-nitrophenol shows intermolecular H-bonding
melting point of o-nitrophenol is LOWER than those of m- and p-nitrophenols
o-nitrophenol is more volatile in STEAM than those of m- and p-isomer

Solution :Due to chelatio, o-nitrophenol is LESS soluble in water than m- and p-isomers.
30.

Ortho -nitrophenol is less soluble in water than p-and m-nitrophenols because

Answer»

o-nitrophenol is more volatile STEAM than those of m-and p-isomers
o-nitrophenol shows INTRAMOLECULAR H-bonding
o-nitrophenol shows intermolecular H-bonding
Melting POINT of o-nitrophenol is LOWER than those of m- and p- isomers

Solution :
31.

Ortho-Nitrophenol is less soluble in water than p- and m- Nitrophenols because :

Answer»

o-Nitrophenol is more volatile than those of m- and p-ISOMERS.
o-Nitrophenol SHOWS intramolecular H-bonding
o-Nitrophenol shows intermolecular H-bonding
Melting point of o-Nitrophenol is lower than those of m- and p-isomers.

Solution :o-Nitrophenol shows intramolecular H-bonding and forms chelate. COMPOUNDS involved in chelation become non-polar. Consequently such compounds are soluble in non-polar solvents like ether, benzene ETC and are only sparingly soluble in WATER whereas meta and para isomers are more soluble in water & less soluble in non-polar solvents.
32.

Ortho- nitrophenol is less soluble in water than p-and m-nitrophenols because :

Answer»

o-nitrophenol showns intramolecular H bonding
o-nitrophenolshows INTERMOLECULAR H - bonding
MELTING POINT of o-nitrophenol is lower than those of m-and p-isomers
o-nitrophenol is morevolatile in STEAM than those of m-and p-isomers.

Answer :A
33.

Ortho -Nitrophenol is less soluble in water than p-and m- Nitrophenol because

Answer»

<P>o-Nitrophenol is more volatile is steam that those of m- and p- isomers
o- Nitrophenol shows INTRA molecular H- bonding
o- Nitrophenol shows intermolecular H- bonding
Melting point of o- Nitrophenol is lower than those of m- and - p -isomers

ANSWER :B
34.

Ortho-nitro acetanilide is removed from p-nitro acetanilide by crystallisation from:

Answer»

HOT water
benzene
rectified SPIRIT
acetone.

Answer :C
35.

Ortho isomer of nitrophenol is steam volatiledue to _________.

Answer»

INTER molecularhydrogen BONDING
INTRA molecularhydrogen bonding
HYDROGEN bonding
COVALENT bonding

Answer :B
36.

Ortho effect is a special type of effect that is shown by d-substituents, but it is not necessarily just a steric effect.This ortho-effect opertes with the benzoic acid.Irrespective of the polar types nearly all o-substitued benzoic acid are stronger than unsubstituted beznoic acid.Benzoic acid is a resonance hybrid and so the carboxyl group is coplanar with the ring.An o-substituent tends to prevent this coplanarity . Ortho effect also opertes in substituted anilines where as ortho substituent has base weakening effect. What is the order of acidity of following compounds :

Answer»

IgtIVgtIIIgtII
IgtIIIgtIVgtII
IVgtIgtIIIgtII
IIIgtIVgtIgtII

Solution :(i)Is STRONGEST due to intramolecular bond formation in conjugate BASE.
(iv)Comes NEXT due to intramolecular H bonding with OH GROUP.
(iii)Comes next due to ortho EFFECT.
37.

Ortho effect is a special type of effect that is shown by d-substituents, but it is not necessarily just a steric effect.This ortho-effect opertes with the benzoic acid.Irrespective of the polar types nearly all o-substitued benzoic acid are stronger than unsubstituted beznoic acid.Benzoic acid is a resonance hybrid and so the carboxyl group is coplanar with the ring.An o-substituent tends to prevent this coplanarity . Ortho effect also opertes in substituted anilines where as ortho substituent has base weakening effect. What is the order of basicily of following compounds ?

Answer»

IltIIltIIIltIV
IVltIltIIltIII
IVltIIIltIltII
IVltIIIltIIltI

Solution :DUE OT ELECTRONIC EFFECTS.
38.

Ortho-dihydroxy toluenes

Answer»

Carvacrol
Resorcinol
CATECHOL
Orcinol

Solution :
o-dihydroxy BENZENE or catechol.
39.

Ortho cresol and benzyl alcohol are

Answer»

Chain ISOMERS
Positional isomers
FUNCTIONAL isomers
Metamers

ANSWER :C
40.

Ortho chlorotoluene on oxidation with KMnO_(4) gives :

Answer»

BENZOIC ACID
TOUENE
o-Chlorobenzoic acid
o-Chlorobenzaldehyde

SOLUTION :
41.

Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions

Answer»

SOLUTION :
SIMILARLY DRAW the STRUCTURES of p-nitrophenoxide ION.
42.

Ortho and para - nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoide ions.

Answer»

Solution :The RESONANCE structures of o - and p- nitrophenoxide ions and phenoxide ion are SHOWN below :

Due to `-R` EFFECT of the `-NO_(2)` group, o- and p - nitrophenoxide ions are more STABLE than phenodie ion. Also there are additional resonance structures, III and IX, which add to the stability of the phenoxide ion. As a result, o - and p - nitrophenols are more ACIDIC than phenol.
43.

Ortho and para-nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.

Answer»

Solution :The resonance STRUCTURE of o- and p nitrophenoxide IONS and phenoxide ion are given below:

It is evident from the above structures that due to -R-effect of the `-NO_(2)` group, o- and p-nitrophenoxide ions are more stable (because of ADDITIONAL resonance structures, III and IX ENCLOSED in boxes) than phenoxide ion. as a result, o- and p-nitrophenols are more acidic than phenol.
44.

Ortho and para nitrophenols are more acidic than phenol. Draw the reasonationg structures of the corresponding phenoxide ions.

Answer»

Solution :`to ` The electron pair of O -H bond is pulled towards the oxygen ATOM because of -M effect of `-NO_2` that decreases the electron density on the oxygen atom. This FACILITATES the RELEASE of protron and stabilizes the phenoxide ion.
`to` RESONATING forms of o-nitrophenoxide ion :
45.

Ortho and para hydrogen have

Answer»

identical CHEMICAL properitesbut differentphysical PROPERTIES
identical PHYSICAL and chemical properties
identical physical properties but DIFFERENT chemical properties
different physical and chemical properties

Answer :A
46.

Ortho and para hydrogen differ in the:

Answer»

NUMBER of protons
Molecular weight
Nature of SPINS of protons
Nature of spins of electrons

Answer :C
47.

Orlon is prepared frompolymerization of

Answer»

`CH_3-CH=CH_2`
`CF_2=CF_2`
`CH_2=CH-CN`
`CH_2=CH-Cl`

ANSWER :C
48.

Ornamental gold containing copper is an example for what type of solution?

Answer»

SOLUTION :SOLID is solid TYPE of solution (COLLOIDAL Solution)
49.

Orlon or acrilan is

Answer»

`(-CH_(2)-UNDERSET(CN)underset("|")"CN"-)_(N)`
`({:(""CH_(3)),("|"),(-CH_(2)-C-),("|"),(""COOCH_(3)):})_(n)`
`({:(-CH_(2)-CH-),("|"),(""COOC_(2)H_(5)):})_(n)`
`(-CH_(2)-underset(Cl)underset(|)CH-)_(n)`

Answer :A
50.

Orlon is a polymer of:

Answer»

Styrene
Acrylonitrile
Vinyl chloride
Tetrafluoro ethylene

Answer :B